Northern Airborne Technology AA86 - Manual (Page 4)

SM48 Rev.4.00 AA86/87 Stereo Intercom Manual
Nov 12, 2003 Page 1-1
ENG-FORM: 800-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Section 1.0 Description
1.1 Introduction
This manual contains information on the AA86/87 Stereo Intercom.
Information in this section consists of purpose of equipment, features and specifications.
1.2 Purpose of Equipment
The AA86/87 series of stereo intercoms provide versatility and performance in a compact,
user-friendly panel mounted system. The AA86 and AA87 series are available in 2, 4 or 6
place models, which gives the flexibility to choose the most suitable system for specific
requirements. Up to 6 positions are available without the need to add expansion modules
or multiplex systems. Full transmit and intercom capability for pilot and co-pilot is
provided, with intercom functions for up to four additional passengers.
1.3 Features
The AA86 and AA87 feature a system volume control for adjusting ICS and radio levels,
mic squelch control, music muting level, and music volume. A bi-colored LED indicates
On/Off and Pilot transmit, while another bi-colored LED indicates Pilot Isolate mode and
Co-pilot transmit. There are four red LED's (two on 2-position models) indicating ICS
microphone activity for pilot, co-pilot, and passengers 1 and 2.
The AA86 and AA87 employ NAT’s exclusive Digitrac
 ‘Auto-tracking’ squelch (to keep
the microphone squelch setting at the right level during shifts in cockpit noise), and an
Automatic Volume Reduction (AVR
) system (which allows the pilot to instantly select
either ATC or intercom as priority communications source). The AVR  system places
the less critical source at a partially muted level for monitoring purposes.
The AA87 (only) can provide Crew Mode capability by installing a remote switch in a
convenient location on the instrument panel. This enables the intercom system to be split
into two independent groups, so that the flight crew can perform radio communication
operations without interruptions from passenger intercom, and the passengers can
converse without stopping whenever the flight crew needs to hear the radio.
The AA86 and AA87 intercoms support various stereo music sources such as portable
tape or CD players, line level and speaker outputs.
The AA86
and AA87 allow the pilot to control the level of muting to suit the situation.
The pilot can choose from a range of full muting during critical communications to none
at all.